add declaring and assignment with parser LHS support

src/parser/assignable/assign/assign.c

@@ -0,0 +1,40 @@
+#include "assign.h"
+#include "../../../lexer/token.h"
+#include "../../parser.h"
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "../../../memory.h"
+
+ParsedValue *parse_assign(char *file, DArray *tokens,
+                          ParsedValue *assign_to, size_t *index) {
+  Token *token = darray_get(tokens, *index);
+  switch (assign_to->type) {
+    case AST_IDENTIFIER:
+    case AST_ASSIGN:
+      break;
+    default:
+      fprintf(stderr, "%s:%u:%u error: can't assign to %s\n", file, token->line,
+              token->column, ValueTypeNames[assign_to->type]);
+      exit(EXIT_FAILURE);
+  }
+  ParsedAssign *assign = checked_malloc(sizeof(ParsedAssign));
+  assign->to = assign_to;
+  assign->type = token->type;
+  (*index)++;
+  error_if_finished(file,tokens,index);
+  token = darray_get(tokens, *index);
+  assign->from = parse_token(file, tokens, index, true);
+  ParsedValue *parsedValue = checked_malloc(sizeof(ParsedValue));
+  parsedValue->type = AST_ASSIGN;
+  parsedValue->data = assign;
+  return parsedValue;
+}
+
+void free_parse_assign(void *ptr) {
+  ParsedValue *parsedValue = ptr;
+  ParsedAssign *parsedAssign = parsedValue->data;
+  free_parsed(parsedAssign->to);
+  free_parsed(parsedAssign->from);
+  free(parsedAssign);
+}

src/parser/assignable/assign/assign.h

@@ -0,0 +1,17 @@
+#ifndef ASSIGN_H
+#define ASSIGN_H
+#include "../../parser.h"
+#include "../../../lexer/token.h"
+
+typedef struct {
+  ParsedValue * to;
+  TokenType type;
+  ParsedValue * from;
+} ParsedAssign;
+
+ParsedValue *parse_assign(char*file, DArray *tokens,
+                          ParsedValue *assign_to, size_t *index);
+
+void free_parse_assign(void*ptr);
+
+#endif // ASSIGN_H